Worm or like milling machine.



P. BROWN 62 F. J. BOSTOCK.

WORM OR LIKE MILLING MACHINE.

APPLIOATION FILED 0012a, 1913.

1,100,521. Patented June 16,1914.

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COLUMBIA PLANOGRAPH co..wAs1-nNOTON, D. c.

UNITED STATES PATENT OFFICE.

PERCY BROWN AND FRANCIS JOHN BOST OCK, OF HUDDERSFIELD, ENGLAND.

WORM OR LIKE MILLING MACHINE.

To all whom it may 001. 0am

Be it known that we, PERCY BROWN and FRANCIS JOHN BosTooK, subjects ofKing (ireorge V of Great Britain, residing at Huddersfield, in thecounty of York, England, have invented certain new and usefulImprovements in WVorm or like Milling Machines, of which the followingis a specification.

This invention in worm milling machines relates to the means forsupporting and traversing and rotating the work in front of the cutterand has for its principal object the provision of a work table ofimproved construction and arrangement to take the strains and thrustsdue to cutting, the slide on which the table is supported being alwaysin compression and therefore free from lateral stresses so that it has asmooth traverse and is not subject to vibration, suitable mechanismbeing provided in conjunction with the said table to traverse and rotatethe work.

According to our invention, the work table has its face arranged at anangle of about 45, and at the base of the inclined face there areprovided openings through which the metal cuttings fall into an inclosedchamber provided with a strainer so that lubricant carried down with thecuttings may be drained away and returned to the pump well for re-use.The inclined table has formed on, or secured to, one end thereof apedestal or bracket, having movable jaws each provided with a plural ityof rollers which are adapted to engage the tail end of the work spindleand form a self-centering steady for same. Inclined work tables havebeen employed in grinding machines and lathes, but our improvements haveno reference to the tables of such machines.

The table is moved endwise to give the correct lead to the worm blankand the latter is slowly rotated in front of the cutter, by gearingwhich will be described.

In the drawings, Figure 1 is a vertical section through a millingmachine con structed according to this invention. Fig. 2 is a detailplan View of a portion of the bed.

In the drawing, 1 represents the bed or framework of the machine, 2 thecutter Specification of Letters Patent.

Application filed October 8, 1913.

Patented June 16, 1914.

Serial No. 794,042.

spindle, carried by a bracket or head 3 mounted on the bed, and 4 theguide way At the base of the inclined face of the table a longitudinalrecess 7 is formed, extending the length of the frame or bed, and in thebottom of this recess are openings 37 communicating with an inclosedchamber 8. The metal cuttings gravitate down the inclined face of thetable 5 into the recess 7 and fall through the openings in the bottom ofthe said recess into the chamber 8, and on to a perforated grid orstrainer 9, through which any lubricant which may be carried down withthe cuttings drains off into a well 10 from whence it flows through apipe 11 back to the pump well for re-use. The cuttings are removed fromthe chamber 8 through a door 12. In various machines provision has beenmade for receiving the metal or like cuttings, draining the lubricanttherefrom and returning such lubricant to the cutters, and no broadclaim is made to any such arrange ment.

Formed on or secured to one end of the inclined face of the table, andin this instance adjustably secured by means of a bolt 13 the head ofwhich enters a longitudinal slot 14 in the table is a pedestal orbracket 15 having two movable jaws 16, 16,

each provided with a plurality, in this in stance two, of rollers 17.The rollers are adapted to engage the tail end of the work spindle,which is indicated by the dotted circle 18, and to form a self-centeringsteady for same. The jaws 16, 16, are adjustable toward or away from oneanother, to acconr modate spindles of different diameters, by means of ascrew provided with a hand wheel 19. The opposite end of the tablecarries the usual driving and dividing head and the chuck or holder inwhich the worm spindle is gripped. These forming no part of our presentinvention are not shown.

By reason of the inclination of the table in the manner set forth thewhole of the strains and thrusts due to cutting are correctly takendirectly on the bed 1 on which the table is supported, and betterresults are thereby obtained.

The correct lead is given to the worm spiral, and the latter is slowlyrotated in front of the cutter in the usual manner, by motiontransmitted from the main driving pulley 20 of the machine through aclutch 21 and a speed gear box 22 to a shaft 23. This shaft, by means ofa worm 24 and worm wheel 25 drives the shaft 26 of a change speed gear,not shown, suitably designed to give a comnlete range of feed speeds,and said shaft 26 drives, through a second clutch, not shown, the maintable shaft 27 from which the work chuck, not shown, is driven by wormand worm wheel. By means of suitable change wheels, not shown, the shaft27 also drives a lead screw 28 carried by the table, said screw workingthrough a nut formed or carried by a fixed bracket or part 29.

Any suitable construction of automatic trip gear is provided to causethe clutch between the change speed gear and the shaft 27 to bedisengaged at the required times to arrest the travel of the table ineither direction.

Having thus described our invention,

what we claim as new and desire to secure by Letters Patent 1s 1. In amilling machine, the combination, 1

and arranged to the rear of the said guide,

and a work-table having a horizontal base surface which slides on thesaid guide and which has a downwardly and rearwardly inclined face forsupporting the work, said face being arranged at an acute angle to thesaid base surface.

2. In a milling machine, the combination, with abed provided with a headand having a guide arranged in front of the hea d a nd. having also alongitudinal recess arranged between the said guide and head andprovided with discharge openings for chips; of a work table mounted inthe said guide and provided with a downwardly and rearwardly inclinedface which discharges the chips into the said recess.

In testimony whereof we afiix our signatures in the presence of twowitnesses.

PERCY BROWN. FRANCIS JOHN BOSTOCK.

\Vitnesses T. E. VVHrrnLnY, C. E. HINCHLIFF.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, I). C.

